Spray gun



Oct. 27, 1959 K. E. KUETER ETAL 2,910,248

SPRAY'GUN Filed Jan. 22, 1957 2 Sheets-Sheet 1 I n Ver? for@ v Oct. 27,1959 K. E. KUETER ETAL Y 2,910,248

In vm tons SPRAY GUN Kenneth E. Kueter, Lake Forest, and Walter S.'Maxim, Libertyville, 1li., assignors to The Kemax Corporation, acorporation of Illinois Application January 22, 1957, Serial No. 635,180

r1 claims. (ci. 239-413) This invention, which is a continuation-impartof application 479,988 tiled January 5, 1955, now ab-andoned, relates toan improved fluid spray gun andy more particularly to a spray -gun whichwill more conveniently discharge a. fluid in a controlled stream.

The accumulation of dirt and debris formed on the surfaces of animalcages, food processing equipment, automotive engines, and on industrialequipment'is generally removed by applying to said surfaces a detergentsolution, and this can most conveniently be accomplished by directing acontrolled stream of a detergent traveling at a relatively high velocityagainst said surfaces followed by rinsing the surfaces with a stream ofwater and drying with air, thereby removing the undesirable material aneffecting the desired cleansing.

It is, therefore, a general object of the present invention to providean improved and more convenient apparatus for applying to a surface, acontrolled stream of a iiuid traveling at a high velocity which `iscapable of effecting a cleansing or coating action.

Another object of the present invention is to provide an improved fluidvalve means for controlling the ilow of fluid passing through a uidspray gun apparatus.

It is a still further object of the invention-to provide an improved uidspray gum capable of selectively mixing and discharging one or aplurality of fluids in acontrolled stream.

Other objects of the invention will be apparent from the detaileddescription and claims to follow.

The foregoing objects and other advantages of the present invention willbe readily appreciated by reference to the following detaileddescription when considered in conjunction with the accompanying drawingshowing the embodiment of the invention wherein:

Figure l is a side elevation view o-f a fluid spray gun embodying thepresent invention;

Figure 2 is a vertical sectional view of the spray gun shown in Figurel;

Figure 3 is a side elevation view of a reciprocating uid valve cylindershown in Figure 2; VFigure 4 is a side elevation view of the fluid valvehousing shown in Figure 2; Y

Figure 5 is a vertical sectional view partially in side elevation of amodified form of the present invention; and

Figure 6 is an exploded isometric view of the end cap, valve cylinderho-using, and discharge barrel of Figure 5.

Generally, the fluid spray guns embodying the present invention,comprise a body section having a hand grip portion with inlet conduitmeans extending therethrough for conveying a compressed fluid, water,and a cleaning or antiseptic agent, respectively, either singly or incornbination, outwardly through a barrel section and into a commondischarge passage and nozzle, and a hand grip pressure actuated valveassembly whichcontrols the ilow of the propelling compressed uid4through the balrel and discharge nozzle.

In Figures 1-4 of the drawing, the iluid mixing gun shown thereincomprises a body section 10 having a rings 29.

and a cleaning or antiseptic agent, respectively.

ice

depending handle portion 11 which is divided longitudinally by partitionmembers 12, 13 to provide three conduit passages 14, 15, and 16extending longitudinally therethrough which conduct a compressed iiuid,water, Integral with the lower end of the handle portion 11 is anadapter member 17 with openings 18, 19, 20 extending therethrough whichat their inner ends coincide with the end o'f the passages 14, 15, and16 extending through the handle portion 11. The adapter member 17 at thelower or outer end of the openings 18, 19, and 20 therein, is threadedto provide means for `connecting uid supply conduits with the respectiveopenings and conduit passages 14, 15, and 16. The member 17 has on theupper surface thereof, a recess or notch 21 which retains and supportsthe lower end 22 of a valve actuating lever 23 consisting of `a iiatrod-like or bar member which conforms generally to the conguration ofthe handle portion 11 ofthe body section 10. The upper end of the valveactuating lever 23 is apertured as at 25 to facilitate operativeengagement with the end of the reciprocating fluid valve cylinder 26 ofthe valve assembly 27 which is disposed in the body section 10 above thecompressedV passage 15. The barrel section 28 also has a passage in vthe lateral surface thereof which is adapted to be placed in alignmentwith the lateral opening 24 in the ring 29 and the water inlet passage15 extending upwardly through the handle portion 11. A pair of sealingrings 30, 30' are positioned at opposite ends of the bushing A mixingchamber 31 is formed in the end of the barrel section V28, wherein lluidowing from the fluid valve means 27 entrains and propels Iwateroutwardly through the barrel 28 and discharge nozzle 32. The axialdischarge outlet of the uid valve means 27 is in axial alignment withthe axis of a Venturi tube or ring 3 3 disposed in the barrel section 28through which the compressed lluid from the valve means 27 passes at arelatively high rate of flow. The ring 33 is formed with an inwardlytapered mouth 34, a restrictedl throat 35, and an outwardly flaredoutlet 36 which has a maxi-` mum ldiameter at the forward endSubstantially that of the barrel 28. The outer lateral surface of theVenturi tube or ring 33 at about the point of minimum diameter of therestricted throat 35 is provided with a ring-like recessed section 37extending around the throat 35. The

recessed section 37 is in direct communication with the detergent orantiseptic inlet passage 16 extending through the handle portion 11.And, at a plurality of points about the periphery of the ring areseveral passages 38 extending through the wall -of the tube 33 into theinterior of the said tube and through which detergent is drawn into theinterior of the said tube when, for example, 4compressed air or amixture of air and water ow through the throat 35 kof the tube 33,thereby mixing the detergent with air and/or water, carrying thecleansing Vmixture through the barrel 28,'and discharging the saidmixture through the restricted outlet nozzle 32. A sealing ring-typegasket 39 is' fitted about the barrel 28 between the said-barrel and theinner surface of the body section 10.

The yfluid valve means 27 is comprised of a fluid valve housing section48, the outside diameter of which is slightly less than the interiordiameter of the end of the body Vsection 1t) so that the valve housingsection 40 can be positioned in the end of the said body section 1l).

Vthe retaining ring 43 of the end closure cap which iixedly positionsthe valve housing 40 in the body section 10.

The lateral surface of the valve housing 40 intermediate lthe endsthereof has a groove 44 which extends about the housing 40 and which isin direct communication with the compressed uid inlet passage 14. At aplurality of points and preferably at 90 degree intervals, severalpassages 45 extend through the wall of the housing 40 into the axialpassage of the said housing.

The forward end of the axial passage extending through the valve housingsection 40 is restricted to provide a reduced diameter section 47 havinga diameter only slightly larger than the outer diameter of thereciprocating valve cylinder 26 which is adapted to be slidably disposedtherein. The large diameter section 48 of the axial passage has iittedin the end thereof, a bushing 49 the inner diameter of which is onlyvery slightly larger than the outer diameter Vof the valve cylinder 26which is reciprocable therein. from the rear of the valve housing 40 upto the edge of lateral passages 45, thereby forming a valve chamber 50which is in direct communication with the compressed uid inlet passage14. A sealing ring 46 is disposed in a groove in the housing 40 adjacentthe end of the housing effectively preventing the leakage of iiuids.

The reciprocating cylinder 26 has an axial passage 51 'extending from apoint intermediate the ends thereof forwardly to the discharge outlet 52which is provided with a restricted nozzle S3 through which the iiuidsdow. A plurality of passages 54 extend through the lateral surface ofthe cylinder 26 into the axial passage 51 adjacent the closed inner endthereof and said passages 54 are adapted to communicate with thecompressed iuid inlet passage 14 when the reciprocating cylinder 26 ismoved to the forwardly position and passages 54 enter valve chamber 50.Sealing rings 55, 56, 57 are mounted in grooves 58, 59, 60 on thecylinder 26 to eectively vprevent leakage of uids between the valvehousing 40 and the reciprocating cylinder 26.

The end of the body section 10 is closed by end cap 61 which is securedto the body section 10 by a plurality of screws 62 and has a slottedsection 63 in the lower portion thereof providing a passage in which theactuating lever 23 is reciprocable.

In the modified form of the invention shown in Figyures 5 and 6 of thedrawing, the iluid mixing gun is comprised of a body section 70 having adepending handle portion 71 which is divided longitudinally by partitionmembers 72, 73 to provide three conduit p assages 74, 75, and 76extending longitudinally therethrough which conduct a compressed fluid,water and a cleaning or antiseptic agent, respectively. The lower end ofthe handle portion 71 has an enlarged section 77 with` fluid conduitadapter means 78, 79, and 80 formed therein which communicate with thepassages 74, 75, and 76, respectively. The section 77 also has on theupper trailing surface thereof, `a recessed portion or notch 81 whichpivotally retains and supports the lower end 82 of a manual valveactuating lever 83 consisting of a ilat rod-like or bar member whichconforms generally to the configuration of the trailing edge of thehandle portion 71 of the body section 70. The upper end 84 of the valveactuating lever 83 operatively engages the end of the reciprocatingcompressed fluid valve cylinder 86 of the valve means 87 which isdisposed in the body section 70 above the fluid passage in the handleportion 71. The forward end of the valve means 87 abuts the rear of thebarrel assembly 88 which is disposed in the body section 70 and which isretained therein by a retaining bolt assembly 85.

The bushing 49 extendsl i The barrel assembly 88 rotatably mounted inthe forward end of the body section 70 is comprised of a tubular barrelmember 88 with an integral bearing ring 89 mounted on the rear or innerend of barrel 88' and having the outer end of the barrel 88 graduallytapered inwardly to form on the end thereof =a small diameter dischargenozzle 90 and preferably having a secondary nozzle adapter means 91formed thereon. Within the interior of the tubular barrel member 88 anddisposed forwardly of the bearing ring 89 is a Venturi ring section 92with a restricted throat portion 93. The barrel member 88 and thebearing ring 89 have lateral passages 94, 94' extending through thelateral walls thereof, with a diameter substantially that of the passage76 and adapted to being disposed in unobstructed communication therewithin at least one of its rotatable positions. The transverse end surface95 of the bearing ring 89 has an axial passage 96- extendingtherethrough which reciprocably receives the outlet end of thereciprocating compressedfluid valve cylinder 86. The end surface 95 alsohas extending therethrough, a concentrically disposed generally crescentshaped passage 9'7 radially spaced from the axial passage 96. A sealingring 98 is positioned about the barrel 88 forwardly of the bearing ring89 and preferably abutting the shoulder 99 of the body section 70,thereby preventing iluid leaking out around the barrel. The rear end ofthe barrel assembly 88 serves as a mixing chamber 100, wherein thecompressed duid from the valve means 87 mixes with, entrains, andpropels the water or the detergent outwardly through the barrel 88' andthe discharge nozzle 90.

The valve means 87 is comprised of a fluid valve housing section 101which is positioned within the body section 70 and which has an axialpassage 101g extending longitudinally therethrough in -which the valvecylinder 86 is reciprocably disposed. The forwardly projecting smalldiameter end 103 of the valve housing section 101 is provided with aremovable cylindrical valve ring 102 having an axial passage 102extending therethrough. The section of the axial passage 102 whichengages the end 103 of the housing is of larger diameter than theremainder of the passage and provides a shoulder 103 against which thecylindrical end 103 abuts. The said valve ring 102 also has a generallycrescent shaped passage 108 which extends longitudinally from one sideof the valve ring 102 parallel with the passage 102 and which is adaptedto being placed in unobstructed communicationwith uid passage andpassage 97 of the bearing ring 89. The valve ring 102 is restrained fromrotating by means of two spaced stop members 104, 104' which projectlaterally from the cylindrical end 103 1and which are spaced about 90apart so as to coact with vthe opposite ends of the crescent shapedpassage 108 on the inner surface of the valve ring 102. The forwardtransverse surface 106 of the valve ring 102 preferably has securedthereto a sealing washer 107 which also has an axial passage and acrescent shaped passage extending therethrough.

The lateral surface of the valve housing 101 intermediate the endsthereof and rearwardly of the small diameter end 103, has a recessedsection 111 formed therein preferably extending circumferentially aboutthe housing 101 and being in direct communication with the compressediluid inlet passage 74. At a plurality of points and preferably atdegree intervals, several passages '112 extend through the lateral wallof the housing 101 into the large diameter section 113 of the axialpassage 101:1 which extends through the said housing 101.

The forward end of the axial passage 101e extending through the valvehousing section 101 is restricted to provide a reduced diameter section114 having a diameter just sufficiently large to permit the forwardsection of the reciprocating valve cylinder 86 to be slidably disposedBushing ring iis having an inner diameter which permits the valvecylinder 86 to reciprocate therein. The bushing 115 preferably extendsfrom the rear of the valve housing 161 to about the lateral passages'112, thereby forming between the bushing 115 and the shoulder 115e ofthe housing 101, a circumferential valve chamber 116 which is in directcommunication'with the air inlet passage 74. If desired, the bushingring 115 could be omitted by enlarging the diameter of the rear sectionof the valve cylinder 86. Sealing rings 117, 118 are disposed in grooves119, 120, in the housing 101 on each side of recessed section 111.

The reciprocating fluid valve cylinder 86 with the larger diameterrearwardly extending section 86' has an axial passage 121 extending froma point intermediate the ends thereof forwardly to the discharge outlet122 which is provided with a restricted nozzle 123 through which thecompressed lluid flows. A'plurality of passages 134 extend through thelateral surface of the reciprocating cylinder 86 into the axial passage121 adjacent the closed vinner end thereof. The said passages 124 are sopositioned as to communicate with the valve chamber 116 `when thereciprocating cylinder 86 is moved forwardly :so that passages 124 entervalve chamber 116. Sealing .rings 125 and 126 are mounted in grooves onthe cylinder 586 on each side of passages 124 to prevent leakage of Ithecompressed fluids between the valve housing 101 and :the reciprocatingcylinder 86.

The rear section of the cylinder 86 is of largerdiame- 4ter than theforward section and is so. proportioned that the shoulder 129 thereon isdisposed at about the rear of `the chamber 116 when the cylinder d6 isin its most rearwardly position. The compressed fluid pressure withinthe chamber 116 thus causes the valve cylinder 86 to normally remain inits rearwardly position and interrupting the flow of compressed fluidthrough passage 12d. Additional sealing rings 127, 128 are mounted ingrooves on the forward section of the cylinder 86. The rear end ofcylinder has provided on the lower surface thereof, a .slot 136 forreceiving the upper end of actuating lever 84. And, mounted on thecylinder 86 forwardly of slot 13d is a stop ring 131 which abuts againstthe bushing ring 115 and which limits the forward movement of thecylinder 86 and prevents jamming the shoulder 115e of the valve cylinder86 against the forward wall of valve chamber 116.

The valve means S7 is maintained in operating position ywithin the bodysection 70 by the end cap 11d which is secured to the body section 70.The cap 110 has projecting lugs 1119, 109 which engage grooves 10% inthe rear end of the housing `101, thereby preventing the housing 101rotating or moving rearwardly.

As a safety valve, the body section 7 0 of the spray gun, in the uppersurface adjacent the rear end thereof, is provided with a generallycylindrical enlargement 140 with a small chamber 141 disposed thereindirectly over the compressed lluid recessed section 111 and inunobstructed communication therewith. Extending rearwardly from thechamber 141 is a small diameter passage 142 which connects with acylindrical exhaust passage 143. At the end of passage 142 is a ballvalve seat 144 for a ball valve 145 which is normally maintained insealing engagement with the valve seat 144 by a spring 146. The spring146 is maintained under compression by the end wall 147 of the end cap11G. On the lateral sur- `face of the enlargement 140 positionedrearwardly of the :face thereof, into which a spring detent or ball 152seats to position the barrel in one of its operating positions i in anolf position,-as desired. The spring detent 152 is ymaintained inoperating position in the slot by a retaining bolt assembly 35 which ismounted in a threaded section 153 on the upper surface of the bodysection 70.

In the operation of the embodiment shown in Figures l-4, the threadedopenings 18, 19, and 20 of the body section of the spray gun areconnected with an air, water, and detergent supply line,respectively.The air is supplied under a pressure of approximately 45 to l0() poundsper square inch and the water is at normal tap pressure. When it isdesired to remove dirt and clean a surface, such as an animal cage, theoperator applies pressure to the actuating lever 23 by firmly grippingthe handle portion 11 of the body section, thereby moving thereciproeating cylinder 26 in a forwardlyv direction until the passages'54 are in substantial alignment with the air inlet passage 45 and thevalve housing 4l) and providing unobstructed flow of air through inletair passage `14 into the axial passage 51 of the reciprocating cylinder26. The compressed air ows outwardly through restricted passage 53 intomixing chamber 31 where the air entrains vwater flowing upwardly throughrWater inlet passage 15 into the Venturi tube or ring 33. The air andwater mixture is carried outwardly through barrel 28 and dischargenozzle 32 and impinges with appreciable vforce upon the surface to becleaned and wetted. During the foregoing operation, a valve in thedetergent'supply line is normally closed. When it is desired to apply adetergent to the surface to be cleaned, the supply of water to thechamber 31 is interrupted by rotating barrel'ZS-until the lateralopening therein is no longer in alignment with inlet opening 24 in ring29. lt should be understood, of course, that the water `supply can alsobe interrupted by providing a valve in the water inlet line. With thevalve in the detergent supply line in the open position, the air valveactuating lever 23 is pressed forwardly allowing air to pass through theair valve means 27 into the reduced diameter or neck section 35 oftheVenturi tube or ring 33 and outwardly through the barrel. When passingthrough the reduced diameter section 35 of the Venturi tube, there is areduction in pressure created which draws detergent solution upwardlythrough the detergent conduit 16 and inwardly through the passages 3Sinto the interior of the Venturi tube. The air and detergent arethoroughly mixed while passing through the Venturi tube and forcedoutwardly through the barrel 28 and discharge nozzle 32. When sui-Heientdetergent has been applied to the surface being cleaned, the valve inthe detergent supply line is closed and the barrel 28 rotated to againalign the water inlet passage with the water supply line so that bypressing actuating lever 23 forwardly the air is again admixed withwater and the air-water mixture forced outwardly through the dischargenozzle, rinsing Way the debris and detergent solution to provide a cleansurface. If desired, a disinfectant may be thereby introduced throughthe detergent supply line and applied to the cleaned surface in the samemanner as the detergent was applied.

The modified form of the present invention as shown in Figures 5 and 6of the drawing, operates on the same general principles and in the samegeneral manner as the embodiment shown in Figures 1-4, and differstherefrom only in the detailed means of introducing the liquid fluidsinto the barrel assembly and in regulating the flow thereof. Thus, thecompressed fluid, such as compressed air, flows through passage 74 intothe passage l121 in the valve cylinder 86 when the actuating lever 83 ispressed forwardly. With the bearing ring 89 and the valve ring 162having the crescent shaped passages 97, 103, respectively, in therelative positions shown in Figure 6 of the drawing, the passage 75 isclosed and the liquid, such as a detergent solution, in llu'id passage76 is drawn into the mixing chamber 100' when `the compressed uid flowsthrough the mixing chamber and'tlie mixture is discharged through thenozzle 90. When the barrel assembly 88 is rotated 90 degreescounterclock- ,wise so that the crescent shaped passage 97 in thebearing ring 89 coincides with the passage 108 in the stationary valvering 102 the lateral passage 94 in the bearing ring is no longer incommunication with the fluid passage 76 and the liquid, such as Water,in the passage 75, flows into the mixing chamber 100 and the mixture ofair and water is discharged through the nozzle 90. If the barrelassembly is rotated 90 degrees in a clockwise direction, the flowthrough both the passages 75 and 76 is interrupted and only thecompressed fluid is discharged when the actuating lever 83 is movedforwardly. In each of the foregoing operations, a spring detent means isprovided to facilitate the proper positioning of the openings, althoughit is also possible to use the apparatus in intermediate positions otherthan the fully open or fully closed positions. With the apparatus of thepresent invention being used in the foregoing manner, the completecleaning operation including the initial application of a strongdetergent solution followed by rinsing with a stream of water beingpropelled by the compressed air and finally blowing the liquids away byair pressure alone can be most conveniently and effectively performedwithout using a plurality of different cleaning tools or highlycumbersome and complicated apparatus.

If desired, the handle portion 71 of the apparatus shown in Figure isprovided with a cover member 160 which serves to insulate the handle inthe event the apparatus is used with one or more heated iluids.

Others may readily adapt the invention for use under various conditionsof service, by employing one or more of the novel features disclosed orequivalents thereof. As at present advised with respect to the apparentscope of our invention, we desire to claim the following subject matter.

We claim:

1. A lluid spray gun comprising a main body section having a dependinghandle portion and a barrel assembly with a discharge nozzle extendingoutwardly from said body section, said handle portion having a pluralityof fluid passages comprising a compressed fluid passage, a first liquidfluid passage, and a second liquid fluid passage extendinglongitudinally therethrough, the said compressed fluid passagedischarging into a valve means disposed in the said body section inaxial alignment with the said barrel assembly, said valve meanscomprising a valve housing section having an axial passage extendingtherethrough and having in the outer surface intermediate the endsthereof a recessed portion which is in communication with the saidcompressed fluid passage and with the interior of the said axialpassage, said valve housing having a fluid valve chamber between theends of the said axial passage in communication with the said recessedportion of the valve housing, a valve cylinder reciprocably disposed inthe said axial passage of the said valve housing having a transverseshoulder intermediate the ends thereof, said valve cylinder having anaxial opening extending from the forward end rearwardly partiallythrough said cylinder to a point rearwardly of the said valve chamberand being provided at a point rearwardly of the said valve chamber withat least one lateral passage extending from the surface thereof intosaid axial opening of the valve cylinder, said lateral passage beingpositioned so that the lateral passage is in communication with the saidiluid valve chamber when the said valve cylinder is in its most forwardposition within the said valve housing and said lateral passage beingout of communication with the said lluid valve chamber when the saidvalve cylinder is in its most rearwardly position, said shoulder of thevalve cylinder being positioned to form at least a part of the rear wallof the said valve chamber, a manually `actuated lever engaging the saidvalve cylinder having a depending shank portion conforming to thegeneral contour of the said handle portion, a fluids mixing chamber insaid barrel assembly disposed forwardly of said iluid valve meansadapted to being placed in communication with at least one of the liquidfluid passages, and said barrel assembly having a ring section with arestricted throat portion disposed in axial alignment with the said mainbody section forwardly of said fluid valve means and mixing chamber;whereby the liquid fluids drawn into the said mixing chamber areconveyed to the said discharge nozzle.

2. A lluid spray gun comprising a main body section having a dependinghandle portion and a rotatable barrel assembly with a discharge nozzleextending outwardly from said body section, said handle portion having aplurality of fluid passages including a compressed iluid passage, afirst liquid duid passage, and a second liquid fluid passage extendinglongitudinally therethrough, the said compressed fluid passagedischarging into a valve housing section non-rotatable disposed in saidbody section in axial alignment with the said barrel assembly, the saidvalve housing section having an axial passage extending longitudinallytherethrough in which a compressed iluid valve cylinder is reciprocablydisposed and being provided with passage means for conveying thecompressed fluid into the interior of said valve cylinder anddischarging the compressed fluid through an axial opening in the forwardend thereof, said valve cylinder being actuated by a manual leveroperatively engaging the said valve cylinder and a depending shankportion conforming generally to the contour of the said handle portion,said valve housing having a forwardly extending cylindrical end sectionwith a cylindrical valve ring disposed thereon having a transverse endface, said ring having an axial passage in which the said valve cylinderis reciprocable and also having a second radially spaced passageextending longitudinally therethrough in communication with one of theliquid iluid passages, said rotatable barrel assembly having integrallyafxed thereto at the rearwardly end thereof a bearing ring with atransverse end face thereon which is adapted to form a sealingengagement with the said transverse end face of the valve ring and whichhas an axial passage suitable for receiving the said valve cylinder,said bearing ring also having a radially spaced second passage adaptedto being placed in conjunction with the said second spaced passage ofthe said valve ring, and said bearing ring also having a transversepassage extending through the lateral wall of the said bearing ringwhich is adapted to being placed in communication with the said secondliquid fluid passage, the said second passage and the said transversepassage of the bearing ring being placed in and out of communicationwith the first and second liquid fluid passages, respectively, byrotation of the said barrel assembly.

3. A fluid spray gun comprising a main body section having a dependinghandle portion and a barrel assembly with a discharge nozzle extendingoutwardly from said body section, said handle portion having a pluralityof passages extending therethrough for communicating with at least twosources of liquids and at least one source of compressed air and saidpassages adapted to delivering said liquids and compressed air at spacedpoints along the length of the main body section, a longitudinallyreciprocable air valve means disposed in the body section forcontrolling the llow of air through the said passages conveyingcompressed air, said air valve means being controlled by a manuallyactuated lever having its upper end engaging the said longitudinallyreciprocable valve means and a depending shank portion conforming to thegeneral contour of the said handle portion, a fluids mixing chamber insaid barrel assembly forwardly of said air valve means and incommunication with the first of said liquid passages, a ring sectionwith a restricted throat portion spaced forwardly of said air valvemeans and said fluids mixing chamber having at least one passageextending. through the walls ofthe throat portion which is in cemtainedin closed position by the pressure of the fluids in` the said airpassage and adapted to being moved to open l position upon manualpressure being applied to the said manually actuated lever.

4. In a spray gun `comprising a main body sectionv having a handleportion extending from the said body secgrants tion and a barrelassembly with a discharge nozzle exte'nd-l f housing section disposed inthe main body section, said4 valve housing section having an axialpassage extending therethrough with the forward portion thereof being oft smaller. diameter and having in the outer surface intermediate theends thereof a recessed portion in communication with one of saidpassages adapted to being placed in communication with a source ofcompressed fluid,a valve cylinder reciprocably disposed in the axialpassage of the said valve housing with the forward end thereof en-lgaging the smaller diameter portion ofthe said axial .passage and theinner end thereof reciprocably disposed inthe inner end of said housing,said valve housing having a Afluid valve chamber between the endsthereof with said chamber being in communication with the said recessedportion of the valve housing, said valve cylinder having an axialopening extending from the forward end rearwardly partially through saidcylinder and provided at a point spaced rearwardly from the said forwardend thereof withat least one lateral passage extending from the surfacethereof into said axial opening of the valve cylinder, said lateralpassage being positioned so that the lateral passage is in communicationwith the said valve chamber when the said valve cylinder is in a mostforwardly position within the said valve housing and being out ofcommunication with the said valve chamber when the said valve cylinderis in a most rearwardly position.

5. In a spray gun comprising a main body section having a handle portionextending downwardly from the said body section and a barrel assemblywith a discharge nozzle extending outwardly from the said body sectionhaving a plurality of passage means for conveying a plurality of fluidsto the main body section with at least one of said passage means adaptedto conveying a compressed fluid; an improved compressed fluid valvemeans comprising a valve housing section disposed in the main bodysection in axial alignment with said barrel section, said valve housinghaving an axial passage extending longitudinally therethrough and havingintermediate the ends thereof a transverse passage extending through thewall of the said housing in communication with a passage conveyingcompressed fluid, a compressed fluid valve cylinder reciprocablydisposed in the said axial passage with the rearwardly extending sectionthereof having a larger diameter than the forwardly extending smalldiameter section, a valve chamber formed between the lateral surface ofthe small diameter section of the valve cylinder and the section of thevalve housing having the said transverse passage etxending therethrough,the said chamber having as at least a portion of the rear wall thereof atransverse sage extending through the wall f the iilv cylinder, saidlateral passage being disposed so that the lateral passage is incommunication with the said valve chamber when the valve cylinder ismoved to a forwardly position withinthe said valve housing and is outofcommunication with the said valve chamber when the said valve cylinderis in its normal rearwardly position.

6. In ya spray gun comprising a main body section.:Vv having a handleportion extending downwardly from ythe said body section and a barrel'assembly with a discharge-- nozzle extending outwardly from thelsaidbody section- ,y having a plurality of passage means for conveyingI aplu--v rality offluids to the main bodyfsection with atleast onel ofsaid passage means adapted to conveying a compressed,` fluid and atleasttwo of said kpassage means adapted to conveying a liquid fluid, landsaid barrel section being ro` tatable in said body section to controlthe flow of said.

y liquid fluids through the said gun; an improved liquid fluid".

the compressed fluid into the interior of said valve means.

and discharging the said compressed fluidthrough an axial opening in theforward end thereof, said lvalve housing having the forwardly extendingsection thereof in the form of a small diameter end section on which isdisposedv a cylindrical valve ring with aftransverse lend face, said Yvalve ring having an axial passage in whichthe forward` section of thesaid valve cylinder is reciprocable and also having a second radiallyspaced passage extending longitudinally therethrough in communicationwith one of theV liquid fluid passages, said rotatable barrel assemblyhaving integrally associated therewith4 at the rearwardly end s thereofa rotatable bearing ring with a transverse end face which is adapted toform a sealing engagement with the said transverse face of the saidvalve ring and which has an axial passage suitable for conveying thecompressed fluid, said bearing ring also having a radially spaced secondpassage adapted to being placed in conjunction with the said radiallyspaced passage in the said valve ring,

n andsaid bearing ring also having a transverse passage exwall sectionof the valve cylinder providing a surface y* tending through the lateralwallof said bearing ring *which` is adapted to being placed incommunication with another liquid fluid passage; whereby the said secondpassage and said transverse passage in the said bearing ring are placedinV and out of communication with the said liquid fluid passages,respectively, by rotationV of the said barrel assembly.

7. In a spray gun comprising a main body section having a handle portionand a barrel assembly rotatably disposed on said body section with'adischarge nozzle extending outwardly therefrom and having a plurality ofpassage means for lconveying a plurality ofv fluids to the main lbodysection with one of said passage means adapted to conveying a compressedfluid and at least one of said'v passage means adapted to conveying aliquid fluid; and

improved liquid fluid valve means comprising a fluid valve housingnon-rotatably disposed in the main body section in axial alignment withthe said rotatable barrel assembly, said valve housing having an axialpassage means through which the compressed fluid flows into the barrelassembly, said valve housing having the forwardly ex-v tending sectionthereof in the form of a cylindrical valve ring with a transverse endface, said valve ring having a second passage spaced radially from theaxial passage therethrough adapted to communicate with, one said liquidfluid passage means, said rotatable barrel assembly having integrallyassociated therewith at the rearwardly endk thereof a rotatable bearingring with a transverse end face which is adapted to form a sealingengagement with the said transverse face of the valve ring, said bearingring also having a second passage extending therethrough

